I purchased a Avenger Bullpup 22 cal a couple weeks ago. I have a chrony and I tuned the Avenger for max power shooting ZAN 23g .218 slugs at about 891 ft/sec. My reg is at 2900 and the hammer spring at 1/4 turn from max clockwise. My muzzle energy has been drifting down w/o any adjustments. Do...
